I have a 10 week old cochin bantam pullet that has all of a sudden came up lame. I have had a couple of other hens act the same. Weird walking, no obvious pain or broken bones. I nurse the life out of them. They never walk again. I'm starting to think it is a common injury among chickens??? I think maybe one of my older roos jumped on her..?? I love her but I feel bad, I don't think she'll walk again..